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Merge #6348

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6348: Add comments explaining UUID generation r=Chairn a=Robyt3



## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test (especially base/) or added coverage to integration test
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: Robert Müller <robytemueller@gmail.com>
This commit is contained in:
bors[bot] 2023-02-20 19:25:12 +00:00 committed by GitHub
parent d347bfcbe9 12e8f19421
commit d4e2c2f7a4
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7
src/engine/shared/uuid_manager.cpp
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@ -15,8 +15,11 @@ CUuid RandomUuid()
CUuid Result;
secure_random_fill(&Result, sizeof(Result));
// set version 4 (UUID is randomly generated)
Result.m_aData[6] &= 0x0f;
Result.m_aData[6] |= 0x40;
// set variant 1 (RFC 4122)
Result.m_aData[8] &= 0x3f;
Result.m_aData[8] |= 0x80;
@ -38,10 +41,14 @@ CUuid CalculateUuid(const char *pName)
Result.m_aData[i] = Digest.data[i];
}
// set version 3 (UUID is generated by MD5 hashing a namespace identifier and a name)
Result.m_aData[6] &= 0x0f;
Result.m_aData[6] |= 0x30;
// set variant 1 (RFC 4122)
Result.m_aData[8] &= 0x3f;
Result.m_aData[8] |= 0x80;
return Result;
}